They are two different pieces of equipment. With Karma, you can do everything rooftop tents do and much more! Rooftop tents are designed for overlanding; they are comfortable for sleeping but are quite heavy and less functional for everyday life and car camping.
In contrast, CampUp Karma is designed for car camping, as a lightweight and minimalist solution for outdoor sleeping, but not only that! It allows for easy transportation of bicycles, kayaks, skis, fishing rods, and everything needed for outdoor adventures. With Karma, you can do everything rooftop tents do and much more!